Octagon House (Westfield, Massachusetts)

The Octagon House is an historic octagonal house located at 28 King Street in Westfield, Massachusetts. It was built sometime between 1858 and 1864 by Joseph Watson. His construction was a two story eight-sided structure with a hip roof and a central eight-sided cupola. Between 1870 and 1875 a rectangular extension, also two stories, was added onto the back of the house. The only other major modification was in about 1900, when a Queen Anne style porch was added to the front.

The house was listed on the National Register of Historic Places in 1982, and included as part of expansion of the Westfield Center Historic District in 2013.